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molbox™ RFM™ OPERATION AND MAINTENANCE MANUAL
If molbox RFM is able to communicate with an RPMx on its COM2 port, the display is:
Observe the pressure outputs verify that they are stable. A 10 to 15 minute wait,
after venting, is recommended before running AutoZ. When ready, press [ENT]
to cause AutoZ to run. molbox RFM logs both RPT readings and calculates a
new AutoZ offset value. The display is:
1.
2.
3.
4.
Press [ENT] to activate the new values of P
3.4.4.5
To quickly measure the molbloc-S upstream and downstream pressure and
calculate and display the BPR (back pressure ratio) when molbox RFM is in a
molbloc-S BPR mode which would not otherwise measure the BPR.
molbox RFM uses the back pressure ratio, or BPR (the ratio of the molbloc-S
downstream absolute pressure to the upstream absolute pressure) to determine
whether the flow through the throat of the molbloc-S venturi nozzle is critical and
flow measurements within predictable uncertainty limits can be made with
molbloc-S (see Section 3.1.2). When operating molbox RFM with molbloc-S, the
user may select different BPR monitoring modes (see Section 3.6.9). The BPR
function allows the user to measure and display BPR directly at any time
regardless of the current BPR mode.
© 1998-2007 DH Instruments, a Fluke Company
1.
Real time reading (without head correction) of
upstream (1, Hi) RPT in unit of measure on
line 2.
2.
Real time reading (without head correction) of
downstream (2, Lo) RPT in unit of measure on
line 2.
3.
Real time reading of the RPMx connected to
molbox RFM COM2 to provide the value of
AutoZ P
.
offset
Current/previous
value
of
upstream (1, Hi) RPT.
Current/previous
value
of
downstream (2, Lo) RPT.
New value of P
for the upstream (1, Hi) RPT
offset
for the AutoZ that was just run.
New value of P
for the downstream (2, Lo)
offset
RPT for the AutoZ that was just run.
The value of P
is always displayed and entered in Pascal (Pa).
offset
<5BPR> (molbloc-S OPERATION ONLY)
PURPOSE
The <5BPR> menu selection is only present during molbloc-S operation.
PRINCIPAL
Page 58
96.772 kPaa
Pstd,0:96.7752
P
for
the
offset
P
for
the
offset
Old: 0.0 Pa 0.0
New: 3.7 Pa 2.6
or [ESC] to start over.
offset
96.778
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